Question

would you和could的区别是什么呢？

Answer 1

区别是：would you比Could you更委婉。
could you一般用于问对方你能做什么吗?
would you一般用于问对方你能愿意做什么的意思。

例句辨析：
could you
1、Please could you advise me what I should do?
能不能请您就我该做什么给点建议呢？
2、Could you have given them the wrong drug by mistake?

你有没有可能一时疏忽给错他们药了呢？
3、Could you have forgotten such an important matter?

这么重要的事，难道你忘了吗？

would you
1、Would you like to tell me what happened?
能告诉我发生了什么事吗？
2、If I write a letter, would you post it for me?

如果我写封信，你能替我寄出去吗？
3、Would you call me as soon as you find out?

你一弄清楚了就给我打电话好吗？